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efi/arm: Fix boot crash with CONFIG_CPUMASK_OFFSTACK=y
[mirror_ubuntu-artful-kernel.git] / drivers / usb / gadget / configfs.c
1 #include <linux/configfs.h>
2 #include <linux/module.h>
3 #include <linux/slab.h>
4 #include <linux/device.h>
5 #include <linux/nls.h>
6 #include <linux/usb/composite.h>
7 #include <linux/usb/gadget_configfs.h>
8 #include "configfs.h"
9 #include "u_f.h"
10 #include "u_os_desc.h"
11
12 int check_user_usb_string(const char *name,
13 struct usb_gadget_strings *stringtab_dev)
14 {
15 unsigned primary_lang;
16 unsigned sub_lang;
17 u16 num;
18 int ret;
19
20 ret = kstrtou16(name, 0, &num);
21 if (ret)
22 return ret;
23
24 primary_lang = num & 0x3ff;
25 sub_lang = num >> 10;
26
27 /* simple sanity check for valid langid */
28 switch (primary_lang) {
29 case 0:
30 case 0x62 ... 0xfe:
31 case 0x100 ... 0x3ff:
32 return -EINVAL;
33 }
34 if (!sub_lang)
35 return -EINVAL;
36
37 stringtab_dev->language = num;
38 return 0;
39 }
40
41 #define MAX_NAME_LEN 40
42 #define MAX_USB_STRING_LANGS 2
43
44 static const struct usb_descriptor_header *otg_desc[2];
45
46 struct gadget_info {
47 struct config_group group;
48 struct config_group functions_group;
49 struct config_group configs_group;
50 struct config_group strings_group;
51 struct config_group os_desc_group;
52
53 struct mutex lock;
54 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
55 struct list_head string_list;
56 struct list_head available_func;
57
58 struct usb_composite_driver composite;
59 struct usb_composite_dev cdev;
60 bool use_os_desc;
61 char b_vendor_code;
62 char qw_sign[OS_STRING_QW_SIGN_LEN];
63 };
64
65 static inline struct gadget_info *to_gadget_info(struct config_item *item)
66 {
67 return container_of(to_config_group(item), struct gadget_info, group);
68 }
69
70 struct config_usb_cfg {
71 struct config_group group;
72 struct config_group strings_group;
73 struct list_head string_list;
74 struct usb_configuration c;
75 struct list_head func_list;
76 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
77 };
78
79 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
80 {
81 return container_of(to_config_group(item), struct config_usb_cfg,
82 group);
83 }
84
85 struct gadget_strings {
86 struct usb_gadget_strings stringtab_dev;
87 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
88 char *manufacturer;
89 char *product;
90 char *serialnumber;
91
92 struct config_group group;
93 struct list_head list;
94 };
95
96 struct os_desc {
97 struct config_group group;
98 };
99
100 struct gadget_config_name {
101 struct usb_gadget_strings stringtab_dev;
102 struct usb_string strings;
103 char *configuration;
104
105 struct config_group group;
106 struct list_head list;
107 };
108
109 static int usb_string_copy(const char *s, char **s_copy)
110 {
111 int ret;
112 char *str;
113 char *copy = *s_copy;
114 ret = strlen(s);
115 if (ret > 126)
116 return -EOVERFLOW;
117
118 str = kstrdup(s, GFP_KERNEL);
119 if (!str)
120 return -ENOMEM;
121 if (str[ret - 1] == '\n')
122 str[ret - 1] = '\0';
123 kfree(copy);
124 *s_copy = str;
125 return 0;
126 }
127
128 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
129 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
130 char *page) \
131 { \
132 return sprintf(page, "0x%02x\n", \
133 to_gadget_info(item)->cdev.desc.__name); \
134 }
135
136 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
137 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
138 char *page) \
139 { \
140 return sprintf(page, "0x%04x\n", \
141 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
142 }
143
144
145 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
146 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
147 const char *page, size_t len) \
148 { \
149 u8 val; \
150 int ret; \
151 ret = kstrtou8(page, 0, &val); \
152 if (ret) \
153 return ret; \
154 to_gadget_info(item)->cdev.desc._name = val; \
155 return len; \
156 }
157
158 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
159 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
160 const char *page, size_t len) \
161 { \
162 u16 val; \
163 int ret; \
164 ret = kstrtou16(page, 0, &val); \
165 if (ret) \
166 return ret; \
167 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
168 return len; \
169 }
170
171 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
172 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
173 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
174
175 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
176 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
177 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
178 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
179 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
180 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
181 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
182 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
183
184 static ssize_t is_valid_bcd(u16 bcd_val)
185 {
186 if ((bcd_val & 0xf) > 9)
187 return -EINVAL;
188 if (((bcd_val >> 4) & 0xf) > 9)
189 return -EINVAL;
190 if (((bcd_val >> 8) & 0xf) > 9)
191 return -EINVAL;
192 if (((bcd_val >> 12) & 0xf) > 9)
193 return -EINVAL;
194 return 0;
195 }
196
197 static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
198 const char *page, size_t len)
199 {
200 u16 bcdDevice;
201 int ret;
202
203 ret = kstrtou16(page, 0, &bcdDevice);
204 if (ret)
205 return ret;
206 ret = is_valid_bcd(bcdDevice);
207 if (ret)
208 return ret;
209
210 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
211 return len;
212 }
213
214 static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
215 const char *page, size_t len)
216 {
217 u16 bcdUSB;
218 int ret;
219
220 ret = kstrtou16(page, 0, &bcdUSB);
221 if (ret)
222 return ret;
223 ret = is_valid_bcd(bcdUSB);
224 if (ret)
225 return ret;
226
227 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
228 return len;
229 }
230
231 static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
232 {
233 char *udc_name = to_gadget_info(item)->composite.gadget_driver.udc_name;
234
235 return sprintf(page, "%s\n", udc_name ?: "");
236 }
237
238 static int unregister_gadget(struct gadget_info *gi)
239 {
240 int ret;
241
242 if (!gi->composite.gadget_driver.udc_name)
243 return -ENODEV;
244
245 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
246 if (ret)
247 return ret;
248 kfree(gi->composite.gadget_driver.udc_name);
249 gi->composite.gadget_driver.udc_name = NULL;
250 return 0;
251 }
252
253 static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
254 const char *page, size_t len)
255 {
256 struct gadget_info *gi = to_gadget_info(item);
257 char *name;
258 int ret;
259
260 name = kstrdup(page, GFP_KERNEL);
261 if (!name)
262 return -ENOMEM;
263 if (name[len - 1] == '\n')
264 name[len - 1] = '\0';
265
266 mutex_lock(&gi->lock);
267
268 if (!strlen(name)) {
269 ret = unregister_gadget(gi);
270 if (ret)
271 goto err;
272 } else {
273 if (gi->composite.gadget_driver.udc_name) {
274 ret = -EBUSY;
275 goto err;
276 }
277 gi->composite.gadget_driver.udc_name = name;
278 ret = usb_gadget_probe_driver(&gi->composite.gadget_driver);
279 if (ret) {
280 gi->composite.gadget_driver.udc_name = NULL;
281 goto err;
282 }
283 }
284 mutex_unlock(&gi->lock);
285 return len;
286 err:
287 kfree(name);
288 mutex_unlock(&gi->lock);
289 return ret;
290 }
291
292 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
293 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
294 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
295 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
296 CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
297 CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
298 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
299 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
300 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
301
302 static struct configfs_attribute *gadget_root_attrs[] = {
303 &gadget_dev_desc_attr_bDeviceClass,
304 &gadget_dev_desc_attr_bDeviceSubClass,
305 &gadget_dev_desc_attr_bDeviceProtocol,
306 &gadget_dev_desc_attr_bMaxPacketSize0,
307 &gadget_dev_desc_attr_idVendor,
308 &gadget_dev_desc_attr_idProduct,
309 &gadget_dev_desc_attr_bcdDevice,
310 &gadget_dev_desc_attr_bcdUSB,
311 &gadget_dev_desc_attr_UDC,
312 NULL,
313 };
314
315 static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
316 {
317 return container_of(to_config_group(item), struct gadget_strings,
318 group);
319 }
320
321 static inline struct gadget_config_name *to_gadget_config_name(
322 struct config_item *item)
323 {
324 return container_of(to_config_group(item), struct gadget_config_name,
325 group);
326 }
327
328 static inline struct usb_function_instance *to_usb_function_instance(
329 struct config_item *item)
330 {
331 return container_of(to_config_group(item),
332 struct usb_function_instance, group);
333 }
334
335 static void gadget_info_attr_release(struct config_item *item)
336 {
337 struct gadget_info *gi = to_gadget_info(item);
338
339 WARN_ON(!list_empty(&gi->cdev.configs));
340 WARN_ON(!list_empty(&gi->string_list));
341 WARN_ON(!list_empty(&gi->available_func));
342 kfree(gi->composite.gadget_driver.function);
343 kfree(gi);
344 }
345
346 static struct configfs_item_operations gadget_root_item_ops = {
347 .release = gadget_info_attr_release,
348 };
349
350 static void gadget_config_attr_release(struct config_item *item)
351 {
352 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
353
354 WARN_ON(!list_empty(&cfg->c.functions));
355 list_del(&cfg->c.list);
356 kfree(cfg->c.label);
357 kfree(cfg);
358 }
359
360 static int config_usb_cfg_link(
361 struct config_item *usb_cfg_ci,
362 struct config_item *usb_func_ci)
363 {
364 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
365 struct usb_composite_dev *cdev = cfg->c.cdev;
366 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
367
368 struct config_group *group = to_config_group(usb_func_ci);
369 struct usb_function_instance *fi = container_of(group,
370 struct usb_function_instance, group);
371 struct usb_function_instance *a_fi;
372 struct usb_function *f;
373 int ret;
374
375 mutex_lock(&gi->lock);
376 /*
377 * Make sure this function is from within our _this_ gadget and not
378 * from another gadget or a random directory.
379 * Also a function instance can only be linked once.
380 */
381 list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
382 if (a_fi == fi)
383 break;
384 }
385 if (a_fi != fi) {
386 ret = -EINVAL;
387 goto out;
388 }
389
390 list_for_each_entry(f, &cfg->func_list, list) {
391 if (f->fi == fi) {
392 ret = -EEXIST;
393 goto out;
394 }
395 }
396
397 f = usb_get_function(fi);
398 if (IS_ERR(f)) {
399 ret = PTR_ERR(f);
400 goto out;
401 }
402
403 /* stash the function until we bind it to the gadget */
404 list_add_tail(&f->list, &cfg->func_list);
405 ret = 0;
406 out:
407 mutex_unlock(&gi->lock);
408 return ret;
409 }
410
411 static void config_usb_cfg_unlink(
412 struct config_item *usb_cfg_ci,
413 struct config_item *usb_func_ci)
414 {
415 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
416 struct usb_composite_dev *cdev = cfg->c.cdev;
417 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
418
419 struct config_group *group = to_config_group(usb_func_ci);
420 struct usb_function_instance *fi = container_of(group,
421 struct usb_function_instance, group);
422 struct usb_function *f;
423
424 /*
425 * ideally I would like to forbid to unlink functions while a gadget is
426 * bound to an UDC. Since this isn't possible at the moment, we simply
427 * force an unbind, the function is available here and then we can
428 * remove the function.
429 */
430 mutex_lock(&gi->lock);
431 if (gi->composite.gadget_driver.udc_name)
432 unregister_gadget(gi);
433 WARN_ON(gi->composite.gadget_driver.udc_name);
434
435 list_for_each_entry(f, &cfg->func_list, list) {
436 if (f->fi == fi) {
437 list_del(&f->list);
438 usb_put_function(f);
439 mutex_unlock(&gi->lock);
440 return;
441 }
442 }
443 mutex_unlock(&gi->lock);
444 WARN(1, "Unable to locate function to unbind\n");
445 }
446
447 static struct configfs_item_operations gadget_config_item_ops = {
448 .release = gadget_config_attr_release,
449 .allow_link = config_usb_cfg_link,
450 .drop_link = config_usb_cfg_unlink,
451 };
452
453
454 static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
455 char *page)
456 {
457 return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
458 }
459
460 static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
461 const char *page, size_t len)
462 {
463 u16 val;
464 int ret;
465 ret = kstrtou16(page, 0, &val);
466 if (ret)
467 return ret;
468 if (DIV_ROUND_UP(val, 8) > 0xff)
469 return -ERANGE;
470 to_config_usb_cfg(item)->c.MaxPower = val;
471 return len;
472 }
473
474 static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
475 char *page)
476 {
477 return sprintf(page, "0x%02x\n",
478 to_config_usb_cfg(item)->c.bmAttributes);
479 }
480
481 static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
482 const char *page, size_t len)
483 {
484 u8 val;
485 int ret;
486 ret = kstrtou8(page, 0, &val);
487 if (ret)
488 return ret;
489 if (!(val & USB_CONFIG_ATT_ONE))
490 return -EINVAL;
491 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
492 USB_CONFIG_ATT_WAKEUP))
493 return -EINVAL;
494 to_config_usb_cfg(item)->c.bmAttributes = val;
495 return len;
496 }
497
498 CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
499 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
500
501 static struct configfs_attribute *gadget_config_attrs[] = {
502 &gadget_config_desc_attr_MaxPower,
503 &gadget_config_desc_attr_bmAttributes,
504 NULL,
505 };
506
507 static struct config_item_type gadget_config_type = {
508 .ct_item_ops = &gadget_config_item_ops,
509 .ct_attrs = gadget_config_attrs,
510 .ct_owner = THIS_MODULE,
511 };
512
513 static struct config_item_type gadget_root_type = {
514 .ct_item_ops = &gadget_root_item_ops,
515 .ct_attrs = gadget_root_attrs,
516 .ct_owner = THIS_MODULE,
517 };
518
519 static void composite_init_dev(struct usb_composite_dev *cdev)
520 {
521 spin_lock_init(&cdev->lock);
522 INIT_LIST_HEAD(&cdev->configs);
523 INIT_LIST_HEAD(&cdev->gstrings);
524 }
525
526 static struct config_group *function_make(
527 struct config_group *group,
528 const char *name)
529 {
530 struct gadget_info *gi;
531 struct usb_function_instance *fi;
532 char buf[MAX_NAME_LEN];
533 char *func_name;
534 char *instance_name;
535 int ret;
536
537 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
538 if (ret >= MAX_NAME_LEN)
539 return ERR_PTR(-ENAMETOOLONG);
540
541 func_name = buf;
542 instance_name = strchr(func_name, '.');
543 if (!instance_name) {
544 pr_err("Unable to locate . in FUNC.INSTANCE\n");
545 return ERR_PTR(-EINVAL);
546 }
547 *instance_name = '\0';
548 instance_name++;
549
550 fi = usb_get_function_instance(func_name);
551 if (IS_ERR(fi))
552 return ERR_CAST(fi);
553
554 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
555 if (ret) {
556 usb_put_function_instance(fi);
557 return ERR_PTR(ret);
558 }
559 if (fi->set_inst_name) {
560 ret = fi->set_inst_name(fi, instance_name);
561 if (ret) {
562 usb_put_function_instance(fi);
563 return ERR_PTR(ret);
564 }
565 }
566
567 gi = container_of(group, struct gadget_info, functions_group);
568
569 mutex_lock(&gi->lock);
570 list_add_tail(&fi->cfs_list, &gi->available_func);
571 mutex_unlock(&gi->lock);
572 return &fi->group;
573 }
574
575 static void function_drop(
576 struct config_group *group,
577 struct config_item *item)
578 {
579 struct usb_function_instance *fi = to_usb_function_instance(item);
580 struct gadget_info *gi;
581
582 gi = container_of(group, struct gadget_info, functions_group);
583
584 mutex_lock(&gi->lock);
585 list_del(&fi->cfs_list);
586 mutex_unlock(&gi->lock);
587 config_item_put(item);
588 }
589
590 static struct configfs_group_operations functions_ops = {
591 .make_group = &function_make,
592 .drop_item = &function_drop,
593 };
594
595 static struct config_item_type functions_type = {
596 .ct_group_ops = &functions_ops,
597 .ct_owner = THIS_MODULE,
598 };
599
600 GS_STRINGS_RW(gadget_config_name, configuration);
601
602 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
603 &gadget_config_name_attr_configuration,
604 NULL,
605 };
606
607 static void gadget_config_name_attr_release(struct config_item *item)
608 {
609 struct gadget_config_name *cn = to_gadget_config_name(item);
610
611 kfree(cn->configuration);
612
613 list_del(&cn->list);
614 kfree(cn);
615 }
616
617 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
618 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
619
620 static struct config_group *config_desc_make(
621 struct config_group *group,
622 const char *name)
623 {
624 struct gadget_info *gi;
625 struct config_usb_cfg *cfg;
626 char buf[MAX_NAME_LEN];
627 char *num_str;
628 u8 num;
629 int ret;
630
631 gi = container_of(group, struct gadget_info, configs_group);
632 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
633 if (ret >= MAX_NAME_LEN)
634 return ERR_PTR(-ENAMETOOLONG);
635
636 num_str = strchr(buf, '.');
637 if (!num_str) {
638 pr_err("Unable to locate . in name.bConfigurationValue\n");
639 return ERR_PTR(-EINVAL);
640 }
641
642 *num_str = '\0';
643 num_str++;
644
645 if (!strlen(buf))
646 return ERR_PTR(-EINVAL);
647
648 ret = kstrtou8(num_str, 0, &num);
649 if (ret)
650 return ERR_PTR(ret);
651
652 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
653 if (!cfg)
654 return ERR_PTR(-ENOMEM);
655 cfg->c.label = kstrdup(buf, GFP_KERNEL);
656 if (!cfg->c.label) {
657 ret = -ENOMEM;
658 goto err;
659 }
660 cfg->c.bConfigurationValue = num;
661 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
662 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
663 INIT_LIST_HEAD(&cfg->string_list);
664 INIT_LIST_HEAD(&cfg->func_list);
665
666 config_group_init_type_name(&cfg->group, name,
667 &gadget_config_type);
668
669 config_group_init_type_name(&cfg->strings_group, "strings",
670 &gadget_config_name_strings_type);
671 configfs_add_default_group(&cfg->strings_group, &cfg->group);
672
673 ret = usb_add_config_only(&gi->cdev, &cfg->c);
674 if (ret)
675 goto err;
676
677 return &cfg->group;
678 err:
679 kfree(cfg->c.label);
680 kfree(cfg);
681 return ERR_PTR(ret);
682 }
683
684 static void config_desc_drop(
685 struct config_group *group,
686 struct config_item *item)
687 {
688 config_item_put(item);
689 }
690
691 static struct configfs_group_operations config_desc_ops = {
692 .make_group = &config_desc_make,
693 .drop_item = &config_desc_drop,
694 };
695
696 static struct config_item_type config_desc_type = {
697 .ct_group_ops = &config_desc_ops,
698 .ct_owner = THIS_MODULE,
699 };
700
701 GS_STRINGS_RW(gadget_strings, manufacturer);
702 GS_STRINGS_RW(gadget_strings, product);
703 GS_STRINGS_RW(gadget_strings, serialnumber);
704
705 static struct configfs_attribute *gadget_strings_langid_attrs[] = {
706 &gadget_strings_attr_manufacturer,
707 &gadget_strings_attr_product,
708 &gadget_strings_attr_serialnumber,
709 NULL,
710 };
711
712 static void gadget_strings_attr_release(struct config_item *item)
713 {
714 struct gadget_strings *gs = to_gadget_strings(item);
715
716 kfree(gs->manufacturer);
717 kfree(gs->product);
718 kfree(gs->serialnumber);
719
720 list_del(&gs->list);
721 kfree(gs);
722 }
723
724 USB_CONFIG_STRING_RW_OPS(gadget_strings);
725 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
726
727 static inline struct os_desc *to_os_desc(struct config_item *item)
728 {
729 return container_of(to_config_group(item), struct os_desc, group);
730 }
731
732 static inline struct gadget_info *os_desc_item_to_gadget_info(
733 struct config_item *item)
734 {
735 return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent);
736 }
737
738 static ssize_t os_desc_use_show(struct config_item *item, char *page)
739 {
740 return sprintf(page, "%d",
741 os_desc_item_to_gadget_info(item)->use_os_desc);
742 }
743
744 static ssize_t os_desc_use_store(struct config_item *item, const char *page,
745 size_t len)
746 {
747 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
748 int ret;
749 bool use;
750
751 mutex_lock(&gi->lock);
752 ret = strtobool(page, &use);
753 if (!ret) {
754 gi->use_os_desc = use;
755 ret = len;
756 }
757 mutex_unlock(&gi->lock);
758
759 return ret;
760 }
761
762 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
763 {
764 return sprintf(page, "%d",
765 os_desc_item_to_gadget_info(item)->b_vendor_code);
766 }
767
768 static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
769 const char *page, size_t len)
770 {
771 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
772 int ret;
773 u8 b_vendor_code;
774
775 mutex_lock(&gi->lock);
776 ret = kstrtou8(page, 0, &b_vendor_code);
777 if (!ret) {
778 gi->b_vendor_code = b_vendor_code;
779 ret = len;
780 }
781 mutex_unlock(&gi->lock);
782
783 return ret;
784 }
785
786 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
787 {
788 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
789
790 memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
791 return OS_STRING_QW_SIGN_LEN;
792 }
793
794 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
795 size_t len)
796 {
797 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
798 int res, l;
799
800 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
801 if (page[l - 1] == '\n')
802 --l;
803
804 mutex_lock(&gi->lock);
805 res = utf8s_to_utf16s(page, l,
806 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
807 OS_STRING_QW_SIGN_LEN);
808 if (res > 0)
809 res = len;
810 mutex_unlock(&gi->lock);
811
812 return res;
813 }
814
815 CONFIGFS_ATTR(os_desc_, use);
816 CONFIGFS_ATTR(os_desc_, b_vendor_code);
817 CONFIGFS_ATTR(os_desc_, qw_sign);
818
819 static struct configfs_attribute *os_desc_attrs[] = {
820 &os_desc_attr_use,
821 &os_desc_attr_b_vendor_code,
822 &os_desc_attr_qw_sign,
823 NULL,
824 };
825
826 static void os_desc_attr_release(struct config_item *item)
827 {
828 struct os_desc *os_desc = to_os_desc(item);
829 kfree(os_desc);
830 }
831
832 static int os_desc_link(struct config_item *os_desc_ci,
833 struct config_item *usb_cfg_ci)
834 {
835 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
836 struct gadget_info, os_desc_group);
837 struct usb_composite_dev *cdev = &gi->cdev;
838 struct config_usb_cfg *c_target =
839 container_of(to_config_group(usb_cfg_ci),
840 struct config_usb_cfg, group);
841 struct usb_configuration *c;
842 int ret;
843
844 mutex_lock(&gi->lock);
845 list_for_each_entry(c, &cdev->configs, list) {
846 if (c == &c_target->c)
847 break;
848 }
849 if (c != &c_target->c) {
850 ret = -EINVAL;
851 goto out;
852 }
853
854 if (cdev->os_desc_config) {
855 ret = -EBUSY;
856 goto out;
857 }
858
859 cdev->os_desc_config = &c_target->c;
860 ret = 0;
861
862 out:
863 mutex_unlock(&gi->lock);
864 return ret;
865 }
866
867 static void os_desc_unlink(struct config_item *os_desc_ci,
868 struct config_item *usb_cfg_ci)
869 {
870 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
871 struct gadget_info, os_desc_group);
872 struct usb_composite_dev *cdev = &gi->cdev;
873
874 mutex_lock(&gi->lock);
875 if (gi->composite.gadget_driver.udc_name)
876 unregister_gadget(gi);
877 cdev->os_desc_config = NULL;
878 WARN_ON(gi->composite.gadget_driver.udc_name);
879 mutex_unlock(&gi->lock);
880 }
881
882 static struct configfs_item_operations os_desc_ops = {
883 .release = os_desc_attr_release,
884 .allow_link = os_desc_link,
885 .drop_link = os_desc_unlink,
886 };
887
888 static struct config_item_type os_desc_type = {
889 .ct_item_ops = &os_desc_ops,
890 .ct_attrs = os_desc_attrs,
891 .ct_owner = THIS_MODULE,
892 };
893
894 static inline struct usb_os_desc_ext_prop
895 *to_usb_os_desc_ext_prop(struct config_item *item)
896 {
897 return container_of(item, struct usb_os_desc_ext_prop, item);
898 }
899
900 static ssize_t ext_prop_type_show(struct config_item *item, char *page)
901 {
902 return sprintf(page, "%d", to_usb_os_desc_ext_prop(item)->type);
903 }
904
905 static ssize_t ext_prop_type_store(struct config_item *item,
906 const char *page, size_t len)
907 {
908 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
909 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
910 u8 type;
911 int ret;
912
913 if (desc->opts_mutex)
914 mutex_lock(desc->opts_mutex);
915 ret = kstrtou8(page, 0, &type);
916 if (ret)
917 goto end;
918 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
919 ret = -EINVAL;
920 goto end;
921 }
922
923 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
924 ext_prop->type == USB_EXT_PROP_LE32 ||
925 ext_prop->type == USB_EXT_PROP_BE32) &&
926 (type == USB_EXT_PROP_UNICODE ||
927 type == USB_EXT_PROP_UNICODE_ENV ||
928 type == USB_EXT_PROP_UNICODE_LINK))
929 ext_prop->data_len <<= 1;
930 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
931 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
932 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
933 (type == USB_EXT_PROP_BINARY ||
934 type == USB_EXT_PROP_LE32 ||
935 type == USB_EXT_PROP_BE32))
936 ext_prop->data_len >>= 1;
937 ext_prop->type = type;
938 ret = len;
939
940 end:
941 if (desc->opts_mutex)
942 mutex_unlock(desc->opts_mutex);
943 return ret;
944 }
945
946 static ssize_t ext_prop_data_show(struct config_item *item, char *page)
947 {
948 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
949 int len = ext_prop->data_len;
950
951 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
952 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
953 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
954 len >>= 1;
955 memcpy(page, ext_prop->data, len);
956
957 return len;
958 }
959
960 static ssize_t ext_prop_data_store(struct config_item *item,
961 const char *page, size_t len)
962 {
963 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
964 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
965 char *new_data;
966 size_t ret_len = len;
967
968 if (page[len - 1] == '\n' || page[len - 1] == '\0')
969 --len;
970 new_data = kmemdup(page, len, GFP_KERNEL);
971 if (!new_data)
972 return -ENOMEM;
973
974 if (desc->opts_mutex)
975 mutex_lock(desc->opts_mutex);
976 kfree(ext_prop->data);
977 ext_prop->data = new_data;
978 desc->ext_prop_len -= ext_prop->data_len;
979 ext_prop->data_len = len;
980 desc->ext_prop_len += ext_prop->data_len;
981 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
982 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
983 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
984 desc->ext_prop_len -= ext_prop->data_len;
985 ext_prop->data_len <<= 1;
986 ext_prop->data_len += 2;
987 desc->ext_prop_len += ext_prop->data_len;
988 }
989 if (desc->opts_mutex)
990 mutex_unlock(desc->opts_mutex);
991 return ret_len;
992 }
993
994 CONFIGFS_ATTR(ext_prop_, type);
995 CONFIGFS_ATTR(ext_prop_, data);
996
997 static struct configfs_attribute *ext_prop_attrs[] = {
998 &ext_prop_attr_type,
999 &ext_prop_attr_data,
1000 NULL,
1001 };
1002
1003 static void usb_os_desc_ext_prop_release(struct config_item *item)
1004 {
1005 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1006
1007 kfree(ext_prop); /* frees a whole chunk */
1008 }
1009
1010 static struct configfs_item_operations ext_prop_ops = {
1011 .release = usb_os_desc_ext_prop_release,
1012 };
1013
1014 static struct config_item *ext_prop_make(
1015 struct config_group *group,
1016 const char *name)
1017 {
1018 struct usb_os_desc_ext_prop *ext_prop;
1019 struct config_item_type *ext_prop_type;
1020 struct usb_os_desc *desc;
1021 char *vlabuf;
1022
1023 vla_group(data_chunk);
1024 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1025 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1026
1027 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1028 if (!vlabuf)
1029 return ERR_PTR(-ENOMEM);
1030
1031 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1032 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1033
1034 desc = container_of(group, struct usb_os_desc, group);
1035 ext_prop_type->ct_item_ops = &ext_prop_ops;
1036 ext_prop_type->ct_attrs = ext_prop_attrs;
1037 ext_prop_type->ct_owner = desc->owner;
1038
1039 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1040
1041 ext_prop->name = kstrdup(name, GFP_KERNEL);
1042 if (!ext_prop->name) {
1043 kfree(vlabuf);
1044 return ERR_PTR(-ENOMEM);
1045 }
1046 desc->ext_prop_len += 14;
1047 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1048 if (desc->opts_mutex)
1049 mutex_lock(desc->opts_mutex);
1050 desc->ext_prop_len += ext_prop->name_len;
1051 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1052 ++desc->ext_prop_count;
1053 if (desc->opts_mutex)
1054 mutex_unlock(desc->opts_mutex);
1055
1056 return &ext_prop->item;
1057 }
1058
1059 static void ext_prop_drop(struct config_group *group, struct config_item *item)
1060 {
1061 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1062 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1063
1064 if (desc->opts_mutex)
1065 mutex_lock(desc->opts_mutex);
1066 list_del(&ext_prop->entry);
1067 --desc->ext_prop_count;
1068 kfree(ext_prop->name);
1069 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1070 if (desc->opts_mutex)
1071 mutex_unlock(desc->opts_mutex);
1072 config_item_put(item);
1073 }
1074
1075 static struct configfs_group_operations interf_grp_ops = {
1076 .make_item = &ext_prop_make,
1077 .drop_item = &ext_prop_drop,
1078 };
1079
1080 static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1081 char *page)
1082 {
1083 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1084 return 8;
1085 }
1086
1087 static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1088 const char *page, size_t len)
1089 {
1090 struct usb_os_desc *desc = to_usb_os_desc(item);
1091 int l;
1092
1093 l = min_t(int, 8, len);
1094 if (page[l - 1] == '\n')
1095 --l;
1096 if (desc->opts_mutex)
1097 mutex_lock(desc->opts_mutex);
1098 memcpy(desc->ext_compat_id, page, l);
1099
1100 if (desc->opts_mutex)
1101 mutex_unlock(desc->opts_mutex);
1102
1103 return len;
1104 }
1105
1106 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1107 char *page)
1108 {
1109 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1110 return 8;
1111 }
1112
1113 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1114 const char *page, size_t len)
1115 {
1116 struct usb_os_desc *desc = to_usb_os_desc(item);
1117 int l;
1118
1119 l = min_t(int, 8, len);
1120 if (page[l - 1] == '\n')
1121 --l;
1122 if (desc->opts_mutex)
1123 mutex_lock(desc->opts_mutex);
1124 memcpy(desc->ext_compat_id + 8, page, l);
1125
1126 if (desc->opts_mutex)
1127 mutex_unlock(desc->opts_mutex);
1128
1129 return len;
1130 }
1131
1132 CONFIGFS_ATTR(interf_grp_, compatible_id);
1133 CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1134
1135 static struct configfs_attribute *interf_grp_attrs[] = {
1136 &interf_grp_attr_compatible_id,
1137 &interf_grp_attr_sub_compatible_id,
1138 NULL
1139 };
1140
1141 int usb_os_desc_prepare_interf_dir(struct config_group *parent,
1142 int n_interf,
1143 struct usb_os_desc **desc,
1144 char **names,
1145 struct module *owner)
1146 {
1147 struct config_group *os_desc_group;
1148 struct config_item_type *os_desc_type, *interface_type;
1149
1150 vla_group(data_chunk);
1151 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1152 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1153 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1154
1155 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1156 if (!vlabuf)
1157 return -ENOMEM;
1158
1159 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1160 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1161 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1162
1163 os_desc_type->ct_owner = owner;
1164 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1165 configfs_add_default_group(os_desc_group, parent);
1166
1167 interface_type->ct_group_ops = &interf_grp_ops;
1168 interface_type->ct_attrs = interf_grp_attrs;
1169 interface_type->ct_owner = owner;
1170
1171 while (n_interf--) {
1172 struct usb_os_desc *d;
1173
1174 d = desc[n_interf];
1175 d->owner = owner;
1176 config_group_init_type_name(&d->group, "", interface_type);
1177 config_item_set_name(&d->group.cg_item, "interface.%s",
1178 names[n_interf]);
1179 configfs_add_default_group(&d->group, os_desc_group);
1180 }
1181
1182 return 0;
1183 }
1184 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1185
1186 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1187 {
1188 WARN_ON(1);
1189 return -EINVAL;
1190 }
1191
1192 int composite_dev_prepare(struct usb_composite_driver *composite,
1193 struct usb_composite_dev *dev);
1194
1195 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1196 struct usb_ep *ep0);
1197
1198 static void purge_configs_funcs(struct gadget_info *gi)
1199 {
1200 struct usb_configuration *c;
1201
1202 list_for_each_entry(c, &gi->cdev.configs, list) {
1203 struct usb_function *f, *tmp;
1204 struct config_usb_cfg *cfg;
1205
1206 cfg = container_of(c, struct config_usb_cfg, c);
1207
1208 list_for_each_entry_safe(f, tmp, &c->functions, list) {
1209
1210 list_move_tail(&f->list, &cfg->func_list);
1211 if (f->unbind) {
1212 dev_dbg(&gi->cdev.gadget->dev,
1213 "unbind function '%s'/%p\n",
1214 f->name, f);
1215 f->unbind(c, f);
1216 }
1217 }
1218 c->next_interface_id = 0;
1219 memset(c->interface, 0, sizeof(c->interface));
1220 c->superspeed_plus = 0;
1221 c->superspeed = 0;
1222 c->highspeed = 0;
1223 c->fullspeed = 0;
1224 }
1225 }
1226
1227 static int configfs_composite_bind(struct usb_gadget *gadget,
1228 struct usb_gadget_driver *gdriver)
1229 {
1230 struct usb_composite_driver *composite = to_cdriver(gdriver);
1231 struct gadget_info *gi = container_of(composite,
1232 struct gadget_info, composite);
1233 struct usb_composite_dev *cdev = &gi->cdev;
1234 struct usb_configuration *c;
1235 struct usb_string *s;
1236 unsigned i;
1237 int ret;
1238
1239 /* the gi->lock is hold by the caller */
1240 cdev->gadget = gadget;
1241 set_gadget_data(gadget, cdev);
1242 ret = composite_dev_prepare(composite, cdev);
1243 if (ret)
1244 return ret;
1245 /* and now the gadget bind */
1246 ret = -EINVAL;
1247
1248 if (list_empty(&gi->cdev.configs)) {
1249 pr_err("Need at least one configuration in %s.\n",
1250 gi->composite.name);
1251 goto err_comp_cleanup;
1252 }
1253
1254
1255 list_for_each_entry(c, &gi->cdev.configs, list) {
1256 struct config_usb_cfg *cfg;
1257
1258 cfg = container_of(c, struct config_usb_cfg, c);
1259 if (list_empty(&cfg->func_list)) {
1260 pr_err("Config %s/%d of %s needs at least one function.\n",
1261 c->label, c->bConfigurationValue,
1262 gi->composite.name);
1263 goto err_comp_cleanup;
1264 }
1265 }
1266
1267 /* init all strings */
1268 if (!list_empty(&gi->string_list)) {
1269 struct gadget_strings *gs;
1270
1271 i = 0;
1272 list_for_each_entry(gs, &gi->string_list, list) {
1273
1274 gi->gstrings[i] = &gs->stringtab_dev;
1275 gs->stringtab_dev.strings = gs->strings;
1276 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1277 gs->manufacturer;
1278 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1279 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1280 i++;
1281 }
1282 gi->gstrings[i] = NULL;
1283 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1284 USB_GADGET_FIRST_AVAIL_IDX);
1285 if (IS_ERR(s)) {
1286 ret = PTR_ERR(s);
1287 goto err_comp_cleanup;
1288 }
1289
1290 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1291 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1292 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1293 }
1294
1295 if (gi->use_os_desc) {
1296 cdev->use_os_string = true;
1297 cdev->b_vendor_code = gi->b_vendor_code;
1298 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1299 }
1300
1301 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1302 struct usb_descriptor_header *usb_desc;
1303
1304 usb_desc = usb_otg_descriptor_alloc(gadget);
1305 if (!usb_desc) {
1306 ret = -ENOMEM;
1307 goto err_comp_cleanup;
1308 }
1309 usb_otg_descriptor_init(gadget, usb_desc);
1310 otg_desc[0] = usb_desc;
1311 otg_desc[1] = NULL;
1312 }
1313
1314 /* Go through all configs, attach all functions */
1315 list_for_each_entry(c, &gi->cdev.configs, list) {
1316 struct config_usb_cfg *cfg;
1317 struct usb_function *f;
1318 struct usb_function *tmp;
1319 struct gadget_config_name *cn;
1320
1321 if (gadget_is_otg(gadget))
1322 c->descriptors = otg_desc;
1323
1324 cfg = container_of(c, struct config_usb_cfg, c);
1325 if (!list_empty(&cfg->string_list)) {
1326 i = 0;
1327 list_for_each_entry(cn, &cfg->string_list, list) {
1328 cfg->gstrings[i] = &cn->stringtab_dev;
1329 cn->stringtab_dev.strings = &cn->strings;
1330 cn->strings.s = cn->configuration;
1331 i++;
1332 }
1333 cfg->gstrings[i] = NULL;
1334 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1335 if (IS_ERR(s)) {
1336 ret = PTR_ERR(s);
1337 goto err_comp_cleanup;
1338 }
1339 c->iConfiguration = s[0].id;
1340 }
1341
1342 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1343 list_del(&f->list);
1344 ret = usb_add_function(c, f);
1345 if (ret) {
1346 list_add(&f->list, &cfg->func_list);
1347 goto err_purge_funcs;
1348 }
1349 }
1350 usb_ep_autoconfig_reset(cdev->gadget);
1351 }
1352 if (cdev->use_os_string) {
1353 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1354 if (ret)
1355 goto err_purge_funcs;
1356 }
1357
1358 usb_ep_autoconfig_reset(cdev->gadget);
1359 return 0;
1360
1361 err_purge_funcs:
1362 purge_configs_funcs(gi);
1363 err_comp_cleanup:
1364 composite_dev_cleanup(cdev);
1365 return ret;
1366 }
1367
1368 static void configfs_composite_unbind(struct usb_gadget *gadget)
1369 {
1370 struct usb_composite_dev *cdev;
1371 struct gadget_info *gi;
1372
1373 /* the gi->lock is hold by the caller */
1374
1375 cdev = get_gadget_data(gadget);
1376 gi = container_of(cdev, struct gadget_info, cdev);
1377
1378 kfree(otg_desc[0]);
1379 otg_desc[0] = NULL;
1380 purge_configs_funcs(gi);
1381 composite_dev_cleanup(cdev);
1382 usb_ep_autoconfig_reset(cdev->gadget);
1383 cdev->gadget = NULL;
1384 set_gadget_data(gadget, NULL);
1385 }
1386
1387 static const struct usb_gadget_driver configfs_driver_template = {
1388 .bind = configfs_composite_bind,
1389 .unbind = configfs_composite_unbind,
1390
1391 .setup = composite_setup,
1392 .reset = composite_disconnect,
1393 .disconnect = composite_disconnect,
1394
1395 .suspend = composite_suspend,
1396 .resume = composite_resume,
1397
1398 .max_speed = USB_SPEED_SUPER,
1399 .driver = {
1400 .owner = THIS_MODULE,
1401 .name = "configfs-gadget",
1402 },
1403 .match_existing_only = 1,
1404 };
1405
1406 static struct config_group *gadgets_make(
1407 struct config_group *group,
1408 const char *name)
1409 {
1410 struct gadget_info *gi;
1411
1412 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1413 if (!gi)
1414 return ERR_PTR(-ENOMEM);
1415
1416 config_group_init_type_name(&gi->group, name, &gadget_root_type);
1417
1418 config_group_init_type_name(&gi->functions_group, "functions",
1419 &functions_type);
1420 configfs_add_default_group(&gi->functions_group, &gi->group);
1421
1422 config_group_init_type_name(&gi->configs_group, "configs",
1423 &config_desc_type);
1424 configfs_add_default_group(&gi->configs_group, &gi->group);
1425
1426 config_group_init_type_name(&gi->strings_group, "strings",
1427 &gadget_strings_strings_type);
1428 configfs_add_default_group(&gi->strings_group, &gi->group);
1429
1430 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1431 &os_desc_type);
1432 configfs_add_default_group(&gi->os_desc_group, &gi->group);
1433
1434 gi->composite.bind = configfs_do_nothing;
1435 gi->composite.unbind = configfs_do_nothing;
1436 gi->composite.suspend = NULL;
1437 gi->composite.resume = NULL;
1438 gi->composite.max_speed = USB_SPEED_SUPER;
1439
1440 mutex_init(&gi->lock);
1441 INIT_LIST_HEAD(&gi->string_list);
1442 INIT_LIST_HEAD(&gi->available_func);
1443
1444 composite_init_dev(&gi->cdev);
1445 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1446 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1447 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1448
1449 gi->composite.gadget_driver = configfs_driver_template;
1450
1451 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1452 gi->composite.name = gi->composite.gadget_driver.function;
1453
1454 if (!gi->composite.gadget_driver.function)
1455 goto err;
1456
1457 return &gi->group;
1458 err:
1459 kfree(gi);
1460 return ERR_PTR(-ENOMEM);
1461 }
1462
1463 static void gadgets_drop(struct config_group *group, struct config_item *item)
1464 {
1465 config_item_put(item);
1466 }
1467
1468 static struct configfs_group_operations gadgets_ops = {
1469 .make_group = &gadgets_make,
1470 .drop_item = &gadgets_drop,
1471 };
1472
1473 static struct config_item_type gadgets_type = {
1474 .ct_group_ops = &gadgets_ops,
1475 .ct_owner = THIS_MODULE,
1476 };
1477
1478 static struct configfs_subsystem gadget_subsys = {
1479 .su_group = {
1480 .cg_item = {
1481 .ci_namebuf = "usb_gadget",
1482 .ci_type = &gadgets_type,
1483 },
1484 },
1485 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1486 };
1487
1488 void unregister_gadget_item(struct config_item *item)
1489 {
1490 struct gadget_info *gi = to_gadget_info(item);
1491
1492 mutex_lock(&gi->lock);
1493 unregister_gadget(gi);
1494 mutex_unlock(&gi->lock);
1495 }
1496 EXPORT_SYMBOL_GPL(unregister_gadget_item);
1497
1498 static int __init gadget_cfs_init(void)
1499 {
1500 int ret;
1501
1502 config_group_init(&gadget_subsys.su_group);
1503
1504 ret = configfs_register_subsystem(&gadget_subsys);
1505 return ret;
1506 }
1507 module_init(gadget_cfs_init);
1508
1509 static void __exit gadget_cfs_exit(void)
1510 {
1511 configfs_unregister_subsystem(&gadget_subsys);
1512 }
1513 module_exit(gadget_cfs_exit);
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